Number of essentially series nonequivalent series-parallel networks with n elements and without unit elements in parallel.

A339151

Number of essentially series nonequivalent series-parallel networks with n elements and without unit elements in parallel.

Terms

    a(0) =0a(1) =1a(2) =1a(3) =1a(4) =2a(5) =3a(6) =6a(7) =11a(8) =21a(9) =41a(10) =81a(11) =164a(12) =333a(13) =684a(14) =1417a(15) =2965a(16) =6229a(17) =13182a(18) =28019a(19) =59862a(20) =128376a(21) =276408a(22) =597041a(23) =1293763a(24) =2811181a(25) =6124479a(26) =13374201a(27) =29270703a(28) =64191331a(29) =141041901

External references